<template>
    <div>
        <!-- 面包屑导航 -->
         <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
         </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 警告区 -->
            <el-alert
              title="添加商品信息"
              type="info"
              center
              show-icon :closable="false">
            </el-alert>

            <!-- 步骤条 -->
             <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
               <el-step title="基本信息"></el-step>
               <el-step title="商品参数"></el-step>
               <el-step title="商品属性"></el-step>
               <el-step title="商品图片"></el-step>
               <el-step title="商品内容"></el-step>
               <el-step title="完成"></el-step>
             </el-steps>


            <!-- tab栏区域 -->
               <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                 <el-tabs v-model="activeIndex" :tab-position="'left'"  :before-leave="beforeTabLeave"
                 @tab-click="tabClicked">
                 <el-tab-pane label="基本信息" name="0">
                     <el-form-item label="商品名称" prop="goods_name">
                         <el-input v-model="addForm.goods_name"></el-input>
                     </el-form-item> 
                     <el-form-item label="商品价格" prop="goods_price">
                         <el-input v-model="addForm.goods_price" type="number"></el-input>
                     </el-form-item> 
                     <el-form-item label="商品重量" prop="goods_weight">
                         <el-input v-model="addForm.goods_weight"  type="number"></el-input>
                     </el-form-item> 
                     <el-form-item label="商品数量" prop="goods_number">
                         <el-input v-model="addForm.goods_number"  type="number"></el-input>
                     </el-form-item>
                     <el-form-item label="商品分类" prop="goods_cat">
                         <!-- 级联选择器 -->
                        <el-cascader
                           v-model="addForm.goods_cat"
                           :options="catelist"
                           :props="cateProps"
                           @change="handleChange">
                        </el-cascader>
                     </el-form-item>
                 </el-tab-pane>
                 <el-tab-pane label="商品参数" name="1">
                     <!-- 渲染表单的item项 -->
                     <el-form-item :label="item.attr_name"
                      v-for="item in manyTableData" :key="item.attr_id">
                      <!-- 复选框 -->
                      <el-checkbox-group v-model="item.attr_vals">
                         <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                      </el-checkbox-group>
                      </el-form-item>
                 </el-tab-pane>
                 <el-tab-pane label="商品属性" name="2">
                     <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                         <el-input v-model="item.attr_vals"></el-input>
                     </el-form-item>
                 </el-tab-pane>
                 <el-tab-pane label="商品图片" name="3">
                     <!-- action表示图片要上传到的后台API地址 -->
                     <!-- on-preview预览事件 -->
                     <!-- list-type预览组件的呈现方式 -->
                     <el-upload
                       class="upload-demo"
                       :action="uploadURL"
                       :on-preview="handlePreview"
                       :on-remove="handleRemove"
                       list-type="picture" :headers="headerObj"
                       :on-success="handlesuccess">
                       <el-button size="small" type="primary">点击上传</el-button>
                       <!-- <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div> -->
                     </el-upload>
                 </el-tab-pane>
                 <el-tab-pane label="商品内容" name="4">
                     <!-- 富文本编译器组件 -->
                     <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                     <!-- 添加商品的按钮 -->
                     <el-button type="primary" class="btnadd" @click="add">添加商品</el-button>
                 </el-tab-pane>
                 </el-tabs>
               </el-form>

            
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
          title="图片预览"
          :visible.sync="previewVisible"
          width="50%"
        >
        <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'

export default {
    data(){
        return {
          activeIndex:'0',
          //添加表单的数据对象
          addForm:{
              goods_name:'',
              goods_price:0,
              goods_weight:0,
              goods_number:0,
              //商品所属分类数组
              goods_cat:[],
              //图片的数组
              pics:[],
              //商品的详情介绍
              goods_introduce:'',
              attrs:[]
          },
          addFormRules:{
              goods_name:[
                 { required:true,message:'请输入商品名称',
                    trigger:'blur'}
              ],
              goods_price:[
                  { required:true,message:'请输入商品价格',
                    trigger:'blur'}
              ],
              goods_weight:[
                  { required:true,message:'请输入商品重量',
                    trigger:'blur'}
              ],
              goods_number:[
                   { required:true,message:'请输入商品数量',
                    trigger:'blur'}
              ],
              goods_cat:[
                   { required:true,message:'请输入商品分类',
                    trigger:'blur'}
              ]
          },
          //商品分类列表
          catelist:[],
          //商品分类列表
          cateProps:{
            label:'cat_name',
            value:'cat_id',
            children:'children',
            expandTrigger:'hover'
          },
          //动态参数的列表数据
          manyTableData:[],
          //静态属性的列表数据
          onlyTableData:[],
          //上传图片的地址
          uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
          //图片上传组件的headers请求头对象
          headerObj:{
            Authorization:window.sessionStorage.getItem('token')
          },
          //预览发生时触发
          previewPath:'',
          //图片预览框默认为隐藏
          previewVisible:false


        }
    },
    //生命周期函数
    created(){
       this.getCateList()
    },
    methods:{
        // 获取所有商品的分类数据
       async getCateList(){
          const {data:res}=await this.$http.get('categories')
          
          if(res.meta.status!==200){
              this.$message.error('获取商品分类失败')
          }

          this.catelist=res.data
        //   console.log( this.catelist);
          
       },
       //级联选择器发生变化会触发的函数
       handleChange(){
           //console.log(this.addForm.goods_cat);
           if(this.addForm.goods_cat.length!==3){
               this.addForm.goods_cat=[]
           }
           
       },
       beforeTabLeave(activeName,oldActiveName){
        //   console.log('即将离开的标签页名字是：'+oldActiveName);
        //   console.log('即将进入的标签页名字是：'+activeName);
        if(oldActiveName==='0' && this.addForm.goods_cat.length!==3){
           this.$message.error('请选择商品分类')
           return false
        }
          
       },
       // 点击商品参数，因为绑定了tab-click事件，获取动态参数
       async tabClicked(){
           //console.log(this.activeIndex);
           if(this.activeIndex=='1'){
               //console.log('动态参数');
               //发送请求
               const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
               if(res.meta.status!==200){
                   return this.$message.error('获取动态参数失败')
               }
               console.log(res.data);
               res.data.forEach(item=>{
                   item.attr_vals=item.attr_vals.length=== 0 ?[]:
                   item.attr_vals.split(' ')
               })
               this.manyTableData=res.data
               
            }else if(this.activeIndex === '2'){
                const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}
                })
                if(res.meta.status!==200){
                    return this.$message.error('获取静态属性失败')
                }
                console.log(res.data);
                // this.onlyTableData=[]
                this.onlyTableData=res.data
                
            }
           
        },
        //处理图片的预览效果
        handlePreview(file){
           console.log(file);
           this.previewPath=file.response.data.url
           this.previewVisible=true
        },
        // 处理移除图片的操作
        handleRemove(file){
            // console.log(file);
            
            //获取将要删除的图片的临时路径
            const filePath=file.response.data.tmp_path
            //从pics中，找到这个图片的对应的索引值
            const i= this.addForm.pics.findIndex(x=>
            x.pic===filePath)
            //调用数组的splice方法，把图片信息对象，从oics数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);
            
        },
        handlesuccess(response){
            console.log(response);
            //拼接得到一个图片的信息对象
            const picInfo={
                pic:response.data.tmp_path
            }
            //将图片纤细对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
            
        },
        //添加商品事件
        add(){
           console.log(this.addForm);
           this.$refs.addFormRef.validate(async valid=>{
               if(!valid){
                   return this.$message.error('请填写必要的表单项')
               }
               //执行添加的业务逻辑
               //深拷贝  lodash cloneDeep(obj)
               const form=_.cloneDeep(this.addForm)
               form.goods_cat= form.goods_cat.join(',')
               // 处理动态参数 
               this.manyTableData.forEach(item=>{
                   const newInfo= {
                      attr_id:item.attr_id,
                      attr_value:item.attr_vals.join(' ')
                    }
                   this.addForm.attrs.push(newInfo)
               }) 
               //处理静态属性    
               this.onlyTableData.forEach(item=>{
                    const newInfo={attr_id:item.attr_id,
                    attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
               })    
               form.attrs=this.addForm.attrs                  
               console.log(form);
               //发起请求添加商品，商品名称必须是唯一的
               const {data:res}=await this.$http.post('goods',form)
               
               if(res.meta.status!==201){
                   return this.$message.error('添加商品失败')
               }
               this.$message.success('添加商品成功')
               this.$router.push('/goods')
           })
           
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin:0 10px 0 0!important;
}
.previewImg{
    width:100%;
}
.btnadd{
    margin-top:15px;
}
</style>
